Hello tao jiang,
Can you see if the log for business partner transfer shows any error? Send me the error details if any.
The transaction (in GTS) for that is /SAPSLL/PARTNER_APPL.
Please confirm you are transferring the business partners from ECC using these transactions:
Vendors: /SAPSLL/CREMAS_DIRR3
Customers: /SAPSLL/DEBMAS_DIRR3
Thanks,
Satish